<template>
  <el-container class="home-container">
    <!--    头部区域-->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出登录</el-button>
    </el-header>
    <!--页面主体区域-->
    <el-container>
      <!--    侧边栏-->
      <el-aside :width="isCollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--        侧边栏菜单区域-->
        <el-menu
            background-color="#323744"
            text-color="#fff"
            active-text-color="#3a96fe"
            :unique-opened="true"
            :collapse="isCollapse"
            :collapse-transition="false"
            :router="true"
            :default-active="activePath">
          <!--          一级菜单-->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!--            一级菜单的模板区域-->
            <template slot="title">
              <!--              图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--              文本-->
              <span>{{ item.authName }}</span>
            </template>
            <!--            二级菜单-->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id"
                          @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <!--              图标-->
                <i class="el-icon-menu"></i>
                <!--              文本-->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--    右侧内容主体-->
      <el-main>
        <!--        路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      isCollapse: false,
      // 被激活的链接地址
      activePath:'',
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出功能
    logout() {
      // 清空token
      window.sessionStorage.clear();
      // 跳转到登陆页面
      this.$router.push('/login');
    },
    // 获取所有的菜单
    async getMenuList() {
      const {data: res} = await this.$http.get('menus');
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.menuList = res.data;
    },
    // 点击按钮，切换左侧菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373c41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;

  > div {
    display: flex;
    align-items: center;

    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #323744;

  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf2;
}

.iconfont {
  margin-right: 10px;
}

.toggle-button {
  background-color: #495165;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>